洒水车水泵泵壳出现裂纹、或者叶轮、倒叶损坏、或者水封破损，都会影响真空度，出现水抽不上来，或者水压过小的现象。
Sprinkler pump shell cracks, or impeller, leaf damage, or seal damage, will affect the degree of vacuum, water pumping, water pressure is too small or the phenomenon.
利用倒谱包络方法解决液压泵轴承故障特征提取和故障诊断的问题。
The cepstrum envelope analysis is applied to solve the problem of the diagnosis of bearing failure to hydraulic pump.
文中详细给出了倒谱包络的模型，然后在频域和倒频域比较正常泵和轴承故障泵的功率谱变化及倒谱包络变化。
At first the cepstrum envelope model is described. Then the vibration spectra of the normal pump and the pump with a bearing failure are compared in frequency domain and in cepstrum envelope domain.
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